2001 YAMAHA YFM400F radiator cap

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DESCRIPTION AND MACHINE
IDENTIFICATION
1. Rear spring preload
adjusting ring
2. Storage box and tool kit
3. Spark plug
4. Rear brake fluid
reservoir
5. Radiator cap
6. Front spring preload
adjusting ring
7. V-belt case
8. Rear brake pedal
9. Front spring preload
adjusting ring
10. Fuel cock
11. Air filter case
12. Fuses13. V-belt cooling duct
check hose
14. Coolant reservoir
15. Oil filter cartridge
16. Engine oil dipstick
17. Rear brake lever
18. Left handlebar switches
19. Starter (choke)
20. Horn switch
21. Drive select lever
22. Speedometer
23. Main switch
24. Fuel tank cap
25. Auxiliary DC jack
26. Right handlebar switch
27. Throttle lever
28. Front brake lever
NOTE:

The machine you have purchased may differ
slightly from those shown in the figures of this
manual.

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3. Remove the reservoir tank cap and add
coolant or distilled water to raise it to the
specified level.
4. Install the panel.CAUTION:Hard water or salt water is harmful to the en-
gine. You may use soft water if you can’t getdistilled water. NOTE:l
If water is added, have a Yamaha dealer
check the antifreeze content of the coolant
as soon as possible.
l
The radiator fan operation is completely
automatic. It is switched on or off accord-
ing to the coolant temperature in the radi-ator.
If your ATV overheats, see page 4-3 for details.Reservoir tank capacity:
0.25 L
1. Coolant reservoir drain hose
1. Flexible de vidange du vase d’expansion
1. Manguera de drenaje del depósito de refrigerante

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Changing the coolant
WARNING
Wait for the engine and radiator to cool before
removing the radiator cap. You could be
burned by hot fluid and steam blown out un-
der pressure. Always put a thick rag over the
cap when opening. Allow any remaining pres-
sure to escape before completely removingthe cap.
1. Put the ATV on a level place.
2. Remove panels E and F. (See pages 8-27 ~
8-29 for removal and installation proce-
dures.)
3. Place a container under the engine and re-
move the coolant drain bolt. (Use a trough
or a similar object as shown to prevent
coolant from spilling on the footrest.)
4. Remove the front carrier and panel C. (See
pages 8-23 and 8-25 for removal and in-
stallation procedures.)
1. Trough
1. Feuille de papier repliée en forme de conduit
1. Pasante1. Coolant drain bolt
1. Boulon de vidange du liquide de refroidissement
1. Perno de drenaje del refrigerante

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5. Remove the radiator cap.
6. Remove the reservoir tank cap.
7. Disconnect the hose on the reservoir tank
side and drain the coolant from the reser-
voir tank.
8. After draining the coolant, thoroughly
flush the cooling system with clean tap
water.
9. Replace the coolant drain bolt washer if it
is damaged and tighten the coolant drain
bolt to the specified torque.
Tightening torque:
Coolant drain bolt:
10 Nm (1.0 m.kg)
1. Coolant reservoir drain hose
1. Boulon de vidange du liquide de refroidissement
1. Manguera de drenaje del depósito de refrigerante1. Radiator cap
1. Bouchon du radiateur
1. Tapa del radiador

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10. Install the reservoir tank hose.
11. Pour the recommended coolant into the
radiator until it is full.CAUTION:Hard water or salt water is harmful to the en-
gine. You may use distilled water if you can’tget soft water. Recommended antifreeze:
High quality ethylene glycol antifreeze
containing corrosion inhibitors for alumi-
num engines.
Antifreeze and water mixing ratio:
1:1
Total amount:
1.1 L
Reservoir tank capacity:
0.25 L

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12. Install the radiator cap.
13. Run the engine several minutes. Stop the
engine and recheck the coolant level in
the radiator. If it is low, add more coolant
until it reaches the top of the radiator.
14. Fill the reservoir tank with coolant up to
maximum level.
15.Install the reservoir tank cap and check for
coolant leakage.NOTE:If any leakage is found, ask a Yamaha dealer toinspect the cooling system.
16. Install the panel and the front carrier.
EBU00283
Front axle boots
Check the protective boots for holes or tears. If
any damage is found, have them replaced by a
Yamaha dealer.
1. Front axle boot (´ 2 each side)
1. Soufflet d’axe avant (´ 2 de chaque côté)
1. Guardapolvo de eje delantero (´ 2 en cada lado)

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Engine overheatingNOTE:If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that itis changed to the recommended coolant as soon as possible.
WARNING
Wait for the engine and radiator to cool before removing the radiator cap. You could be burned by
hot fluid and steam blown out under pressure. Always put a thick rag over the cap when opening.Allow any remaining pressure to escape before completely removing the cap. Wait until the
engine has cooled.
Check the coolant level in the
reservoir tank and/or radiator.
Level is OK.Level is low, check the
cooling system for leakage.
No
leakage.Leakage.
Ask a Yamaha dealer to inspect
and repair the cooling system.Add coolant. (See NOTE.)
Restart the engine. If the engine overheats again, ask a
Yamaha dealer to inspect and/or repair the cooling system.